http://itrus.i2p/itrus.su--linux_t&t--Unity3D--bee_backend_error_284.html
bee_backend error Forcefully killing the process was causing build errors, despite the completion of the tasks, so instead I found a neat, temporary solution until the problem get resolved: add a shell script in the middle to remove the --stdin-canary and forward every other args to the real bee_backend executable.